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Near-equiatomic TiNi alloy exhibits excellent wear resistance, benefiting from its pseudoelasticity and other intrinsic mechanical properties. The pseudoelasticity helps to reduce plastic deformation and absorb impact energy, thus decreasing the material loss. Since the martensitic transformation is temperature dependent, research was conducted to investigate the performance of Ti–51at.%Ni alloy during erosion as a function of temperature and the erodent velocity. The erosion behavior of the TiNi alloy was evaluated using a high-temperature air-jet erosion tester. The worn surface was examined using scanning electron microscopy and the transformation temperature was determined using differential scanning calorimetry (DSC). It was demonstrated that there was a minimum erosion loss with respect to temperature and the velocity of erodent also influenced this minimum erosion loss. Possible mechanism responsible for the erosion behavior of TiNi alloy is discussed. [Copyright &y& Elsevier]

The effect of post-weld heat treatment processing parameters on the microstructure, fracture morphology, fracture toughness and crack propagation direction of the linear friction welded joint for dissimilar titanium alloys was investigated. Results show that weld zone and one side of thermo-mechanically affected zone are weak zones for fracture toughness of linear friction welded joint for dissimilar titanium alloys after welding; post-weld heat treatment can effectively improve the fracture toughness of the weak zones, but has less effect on that of the other side. During the heat treatment process, the fine acicular and equiaxed microstructures in the weak weld zones grow and partly transform into lamellar microstructure which can increase the total length of the crack along with energy consumption and relieve the residual stress, resulting in enhancing the fracture toughness of the joint. Meanwhile, the fracture morphology gradually transforms from intergranular fracture to ductile–brittle mixed fracture and dimple fracture. [ABSTRACT FROM AUTHOR]